Update A und AAAA record for dnsrecord

cloudflare-ddns.sh

#!/bin/bash
# A bash script to update a Cloudflare DNS A and AAAA record with the external IP of the source machine
# Used to provide DDNS service for my home
# Needs the DNS record pre-creating on Cloudflare
# I run this directly on my router (usg) as cronjob every 15 minutes
# put this script in root or another folder
# put the following line in you cron.d folder
# "*/15     *       *       *       *       root    /root/cloudflare-ddns.sh 2>&1 | logger -t cloudflare"

# Proxy - uncomment and provide details if using a proxy
#export https_proxy=http://<proxyuser>:<proxypassword>@<proxyip>:<proxyport>

# Cloudflare zone is the zone which holds the record
zone=exmaple.com
# dnsrecord is the A record which will be updated
dnsrecord=home.exmaple.com

## Cloudflare authentication details
## keep these private
cloudflare_auth_email=<email>
cloudflare_auth_key=<key>

# Get the current external IP address
ipv4=$(curl -4s -X GET https://ifconfig.io)
ipv6=$(curl -6s -X GET https://ifconfig.io)

echo "Current IPv4 is $ipv4"
echo "Current IPv6 is $ipv6"

# if here, the dns record needs updating

# get the zone id for the requested zone
zoneid=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones?name=$zone&status=active" -H "X-Auth-Email: $cloudflare_auth_email" -H "X-Auth-Key: $cloudflare_auth_key" -H "Content-Type: application/json" | jq -r '{"result"}[] | .[0] | .id')
echo "Zoneid for $zone is $zoneid"

# get the dns record id v4
dnsrecordidv4=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$zoneid/dns_records?type=A&name=$dnsrecord" -H "X-Auth-Email: $cloudflare_auth_email" -H "X-Auth-Key: $cloudflare_auth_key" -H "Content-Type: application/json" | jq -r '{"result"}[] | .[0] | .id')
echo "DNSrecordid IPv4 for $dnsrecord is $dnsrecordidv4"
# update the record v4
responsev4=$(curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$zoneid/dns_records/$dnsrecordidv4" -H "X-Auth-Email: $cloudflare_auth_email" -H "X-Auth-Key: $cloudflare_auth_key" -H "Content-Type: application/json" --data "{\"type\":\"A\",\"name\":\"$dnsrecord\",\"content\":\"$ipv4\",\"ttl\":1,\"proxied\":true}")

# get the dns record id v6
dnsrecordidv6=$(curl -s -X GET "https://api.cloudflare.com/client/v4/zones/$zoneid/dns_records?type=AAAA&name=$dnsrecord" -H "X-Auth-Email: $cloudflare_auth_email" -H "X-Auth-Key: $cloudflare_auth_key" -H "Content-Type: application/json" | jq -r '{"result"}[] | .[0] | .id')
echo "DNSrecordid IPv6 for $dnsrecord is $dnsrecordidv6"
# update the record v6
responsev6=$(curl -s -X PUT "https://api.cloudflare.com/client/v4/zones/$zoneid/dns_records/$dnsrecordidv6" -H "X-Auth-Email: $cloudflare_auth_email" -H "X-Auth-Key: $cloudflare_auth_key" -H "Content-Type: application/json" --data "{\"type\":\"AAAA\",\"name\":\"$dnsrecord\",\"content\":\"$ipv6\",\"ttl\":1,\"proxied\":true}")

if [ "$responsev4" != "${responsev4%success*}" ] && [ "$(echo $responsev4 | grep "\"success\":true")" != "" ]; then
  echo "Updated to $ipv4 succesfuly!"
else
  echo 'Something went wrong :('
  echo "Response: $responsev4"
fi

if [ "$responsev6" != "${responsev6%success*}" ] && [ "$(echo $responsev6 | grep "\"success\":true")" != "" ]; then
  echo "Updated to $ipv6 succesfuly!"
else
  echo 'Something went wrong :('
  echo "Response: $responsev6"
fi